Numbers n whose k-th arithmetic derivative is nonzero for all k. Complement of A099308.
4, 8, 12, 15, 16, 20, 24, 26, 27, 28, 32, 35, 36, 39, 40, 44, 45, 48, 50, 51, 52, 54, 55
2 seqfan posts
Sun Jun 26 20:50:01 CEST 2011 [seqfan] Re: degree of integer